Designing LR(O) Parser Part-3

Duration: 6 min

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Module outline

  1. Quantitative Aptitude: Ratio and Proportion (Ratios), Data Interpretation, Mixture and Alligation, Permutation and Combination, Number System, Sequence and Series (Series), Speed Time and Distance, Speed Mathematics and Basic Mathematics, Algebra, Percentage, Profit and Loss, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Partnership
  2. Reasoning Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Seating Arrangements, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Syllogisms, Blood Relations, Puzzle Solving (Puzzles), Inequality, Machine Input-Output
  3. English Language: Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Construction, Pronoun, Preposition, Conjunction, Adverb, Verb, Modals, Articles, Determiner, Interjection
  4. General Awareness: Evolution of Indian Banking (Banking & Financial Awareness), GK- Current Affairs, Static General Knowledge, Indian Economy
  5. C Concepts + MCQs (IT Specialist): C Programming by Yash Sir, C Language Core
  6. Java (IT Specialist): Java
  7. Python (IT Specialist): Python for Placements by Yash Sir, Python Basics
  8. OOPs (IT Specialist): Object Oriented Programming (OOPS)
  9. DBMS (IT Specialist): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  10. SQL (IT Specialist): SQL
  11. Software Engineering (IT Specialist): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Data Structure (IT Specialist): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  13. Operating System (IT Specialist): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  14. Compiler Design (IT Specialist): Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  15. Computer Architecture (IT Specialist): Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Multiprocessors, Programming the Basic Computer
  16. Data Communication & Networking (IT Specialist): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  17. Descriptive Test (Main Exam): English Writing Ability
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a detailed walkthrough of LR(0) parsing construction and execution. The instructor begins by defining a context-free grammar with productions A' -> A and A -> aA / b. He displays the corresponding LR(0) item sets and the resulting deterministic finite automaton (DFA) states labeled I0 through I4. A parsing table is constructed with Action and Goto columns. The core of the lecture demonstrates the parsing process for the input string 'abab'. The instructor meticulously traces the stack operations, showing shifts and reductions based on the parsing table entries. He concludes by visualizing the derivation through a parse tree, reinforcing the connection between the stack trace and the syntactic structure of the input string.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture opens with the grammar definition A' -> A and A -> aA / b written in orange at the top left. The instructor presents the LR(0) items in red boxes, identifying states I0, I1, I2, I3, and I4. To the right, a parsing table is drawn with columns for terminals a, b, $ and non-terminal A. The instructor writes the input string 'abab' in blue ink to begin the trace. He initializes the parsing stack with the initial state 0, marking the start of the shift-reduce parsing process.

  2. 2:00 – 5:00 02:00-05:00

    The instructor executes the trace for 'abab'. He shifts the first 'a' to state 2, writing '0 a 2' on the stack. The second 'a' is also shifted to state 2, resulting in '0 a 2 a 2'. The 'b' is shifted to state 3. Upon reaching state 3, a reduction occurs. The instructor identifies rule 4 (A -> b) and reduces the top of the stack. He pops 'b 3' and pushes 'A' along with the goto state 4 from state 2. The stack updates to '0 a 2 A 4'. He continues this process, reducing 'aA' to 'A' using rule 1, updating the stack to '0 A 1'.

  3. 5:00 – 5:52 05:00-05:52

    The parsing trace concludes with the final reductions. The instructor reduces the remaining 'A' to the start symbol A' using the augmented production. The final stack state is shown as '0 A' 1 $', indicating acceptance. To visualize the result, he draws a parse tree on the right side. The tree has A' at the root, branching down to A, which further branches into 'a' and 'A', eventually matching the input sequence 'abab'. This visual aid connects the abstract stack operations to the concrete syntactic structure.

The video effectively bridges the gap between theoretical LR(0) construction and practical parsing execution. By starting with the grammar and automaton, the instructor establishes the necessary framework. The step-by-step trace of 'abab' serves as a concrete example of how the parsing table drives the stack operations. The final parse tree synthesis confirms that the shift-reduce actions correctly recognized the input string, validating the parsing table construction.

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